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Rubidium · chemical symbol

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Rubidium has 37 protons in every atomic nucleus. Changing that number would make a different element. Source: Rubidium ↗

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  1. 38Strontium · chemical symbolRECALL
    Sr

    Atomic number 38

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  2. 39Yttrium · chemical symbolRECALL
    Y

    Atomic number 39

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  3. 40Zirconium · chemical symbolRECALL
    Zr

    Atomic number 40

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